Implemented way to share video frames between WebKit and Chromium

webkit/glue/media/web_video_renderer.h

Index: webkit/glue/media/web_video_renderer.h
diff --git a/webkit/glue/media/web_video_renderer.h b/webkit/glue/media/web_video_renderer.h
index 8bafb1a7cf10a5f1a51366a6adf2163f521a45d5..c75043d8331cac9e691c6dc6ea57602cc3b11f59 100644
--- a/webkit/glue/media/web_video_renderer.h
+++ b/webkit/glue/media/web_video_renderer.h
@@ -5,6 +5,7 @@
 #ifndef WEBKIT_GLUE_MEDIA_WEB_VIDEO_RENDERER_H_
 #define WEBKIT_GLUE_MEDIA_WEB_VIDEO_RENDERER_H_
 
+#include "media/base/video_frame.h"
 #include "media/filters/video_renderer_base.h"
 
 namespace webkit_glue {
@@ -30,6 +31,15 @@ class WebVideoRenderer : public media::VideoRendererBase {
   virtual void Paint(skia::PlatformCanvas* canvas,
                      const gfx::Rect& dest_rect) = 0;
 
+  // Clients of this class (painter/compositor) should use GetCurrentFrame()
+  // obtain ownership of VideoFrame, it should always relinquish the ownership
+  // by use PutCurrentFrame(). Current frame is not guaranteed to be non-NULL.
+  // It expects clients to use color-fill the background if current frame
+  // is NULL. This could happen when before pipeline is pre-rolled or during
+  // pause/flush/seek.
+  virtual void GetCurrentFrame(scoped_refptr<media::VideoFrame>* frame_out) {}
+  virtual void PutCurrentFrame(scoped_refptr<media::VideoFrame> frame) {}
+
  private:
   DISALLOW_COPY_AND_ASSIGN(WebVideoRenderer);
 };